Mixing solid copper, $5\%$ vinegar, and hydrogen peroxide ($\ce{H2O2}$) causes copper acetate to form. The process will occur very slowly without hydrogen peroxide. Adding $\ce{H2O2}$ speeds the formation of copper acetate.
How can I test the solution to see if all of the acetic acid has been converted into copper acetate?
If possible, provide answers that employ only household items or readily available devices.